/*
  *   Copyright (c) 1998, Regents of the University of California
  *   All rights reserved.
  *   Redistribution and use in source and binary forms, with or without
  *   modification, are permitted provided that the following conditions are met:
  * 
  *       * Redistributions of source code must retain the above copyright
  *         notice, this list of conditions and the following disclaimer.
  *       * Redistributions in binary form must reproduce the above copyright
  *         notice, this list of conditions and the following disclaimer in the
  *         documentation and/or other materials provided with the distribution.
  *       * Neither the name of the University of California, Berkeley nor the
  *         names of its contributors may be used to endorse or promote products
  *         derived from this software without specific prior written permission.
  * 
  *   THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND ANY
  *   EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  *   WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  *   DISCLAIMED. IN NO EVENT SHALL THE REGENTS AND CONTRIBUTORS BE LIABLE FOR ANY
  *   DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  *   (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  *   LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  *   ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  *   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package org.demis.elf.ddlreader;

import org.apache.commons.lang.StringUtils;
import org.demis.elf.ColumnReference;
import org.demis.elf.ForeignKey;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;

/**
 *
 * @author <a href="mailto:demis27@demis27.net">Stéphane Kermabon</a>
 */
public class ForeignKeyHandler extends StackableHandler {

    private ForeignKey foreignKey;

    public ForeignKeyHandler(String qName) {
        this.qName = qName;
    }

    @Override
    public Object getResult() {
        return foreignKey;
    }

    @Override
    public void addObject(Object object) {
        if (object instanceof ColumnReference[]) {
            ColumnReference[] columns = (ColumnReference[])object;

            foreignKey.addReferencedColumn(columns[0], columns[1]);
        }
    }

    @Override
    public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
        foreignKey = new ForeignKey();
        if (StringUtils.isNotEmpty(attributes.getValue("name"))) {
            foreignKey.setName(attributes.getValue("name"));
        }
        if (StringUtils.isNotEmpty(attributes.getValue("referencedTable"))) {
            foreignKey.setExportedTableName(attributes.getValue("referencedTable"));
        }
    }

}
